Balanced slide-valve



(No Model.) 2 Sheets--Sheet 1. R. E. VANDEVENTER.

BALANCED SLIDE VALVE. No. 462,518. Patented Nov. 3, 1891.

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(No Model.) 2 Sheets-Sheet 2. R. E. VANDEVENTER. BALANUED SLIDE VALVE.

No. 462,518. Patented Nov. 3, 1891.

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of the improvement.

UNITED STATES PATENT OFFICE.

ROLAND E. VANDEVENTER, OF MOUNT STERLING, ILLINOIS.

BALANCED SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 462,518, dated November3, 1891.

Application filed May 27, 1891.

To all whom it may concern.-

Be it known that I, ROLAND E. VANDE- VENTER, of Mount Sterling, in thecounty of Brown and State of Illinois, have invented a new and ImprovedBalanced Slide-Valve, of which the following is a full, clear, and exactdescription.

The object of the invention is to provide a new and improved slide-valvefor steam-engines, which is simple and durable in construction, reducesthe friction to a minimum, and permits an easy adjustment relative toits seat.

The invention consists of certain parts and details and combinations ofthe same, as will he hereinafter fully described, and then pointed outin the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a sectional side elevation of the improvement as applied.Fig. 2 is an enlarged sectional side elevation of one corner Fig. 3 is asectional side elevation of part of the improvement. Fig. 4 is a similarview of a modified form of the same. Fig. 5 is an end elevation of theroller and part of the yoke, the latter being in section. Fig. 6 is aplan view of the improvement. Fig. 7 is a like View of a modifled formof the same. Fig. 8 is aperspective "iew of one of the packing-strips.Fig. 9 is a like view of a corner packing-strip. Fig. 10

is a plan View of a valve-seat of modified form. Fig. 11 is a sectionalside elevation of a modified form of the improvement as applied, andFig. 12 is a transverse section of the same.

The engine on which the improvement is applied is provided with theusual cylinder A, carrying the steam-chest B, containing the valve-seatO, with the usual ports over which operates the valve 1), as plainlyshown in Fig. 1. The valve D is connected with a yoke E, made in theshape of an inverted boX and fitting with its sides onto the innersurface of the upwardly-extending sides D of the valve D, as plainlyshown in Fig. 1.

The top of the yoke E supports a longitudinally-extending bar F,connected with the valve-stem G, passing through one end of the SerialNo. 394.246. (No model.)

steam-chest B to connect in the usual manranged one near each end andeach engaged by a roller H, journaledin a suitable support I, secured inthe steam-chest B. Thus when a sliding motion is given to the valve-stemG the bar F,-supporting the yoke E, is moved forward and backward,traveling on the rollers H, so that the slide-valve D is moved in a likedirection by the yoke E, carrying the valve along.

As shown in Fig. 7, a series of bars F may be secured to the yoke E andmounted each upon rollers H, the valve-stem G thus being connected by across-bar G with two adjacent bars F, as shown. In order to insure asteam-tight joint between the sides of the box-shaped yoke E and thesides D of the valve D, packing-strips J are employed beveled on theirunder side to engage corresponding bevels D formed on the sides D of thevalve D. (See Figs. 2, 3, and 4.)

The packing-strips J are pressed onto the beveled seats D by nuts andwashers K, screwing 011 bolts L, held in the sides D, the said boltspassing through elongated apertures in the strips. It will be seen thatthe inner surfaces of the packing-strips engage firmly'the outer surfaceof the sides of the yoke E, while the beveled bottoms rest on thebeveled seats D of the sides D. Instead of using the nut K, an arm N maybe employed for pressing the packingstrips in contact with the yoke andvalve D, as illustrated in Fig. 4. The arm N is held in this case on abolt L, secured to the outer surface of the side D, and having its nut Kscrewed onto the arm N.

In order to prevent the valve D from being unseated on the valve-seat Oby back-pressure in the cylinder, set-screws O are provided screwing inlugs 011 the sides of the yoke E, the lower ends of the said set-screwsbeing about one-eighth or three-sixteenths of an inch above thepacking-strips J, so that when a pressure is exerted against the underside of the valve D the latter cannot move upward, as the saidpacking-strips abut against the said screws 0. As 'the lower ends of thescrews are above the packing or the valve D,

the weight of the yoke'E is wholly carried by the rollers, and as theserollers or the parts resting on them wear away the yoke will bepermittedto sink down in the valve without throwing its weight thereon,which would defeat the very purpose of the invention.

In order to insure a steam-tight joint at the corners of the valve D andthe yoke E, corner packing-strips J are employed (shown in Fig. 9) andare wedge-shaped similarly to the strips J. The latter, as well as thecorner strips J, are formed with the'tongues and grooves J 2 and Jrespectively, adapted to engage one another, so as to insure atight-fitting joint.

If it is deemed necessary to hold the valve D firmly on the seat 0 bythe pressure of the live steam within the steam-chest B, additionalpistons P may be employed, as shown in Fig. 11, the said pistonsextending in correspondingly-shaped openings formed in the top of theyoke E, so that the said pistons are exposed to the pressure of the livesteam in the steam-chest, and thus assist-in holding the valve D on itsseat. The yoke F is prevented from being displaced on the rollers H bysuitable cross-guards supported on posts, as shown in Fig. 5.

If the device is applied on engines already in use, the steam-chest maybe constructed as shown in Fig. 11, having extensions B at the ends topermit the ends of the bar F to pass into the same at the forward andbackward movement of the valve.- If the steam is admitted to thesteam-chest B from underneath, as shown in Fig. 10, then the bearings Iare preferably arranged at the sides of the inletports, as indicated indotted lines in said Fig. 10.

It will be seen that a valve constructed in this manner glides freelyover its valve-seat, being only held to its valve-seat by the pressureof the live steam on the sides D, so that the friction is reduced to aminimum. The wear of the valve D or the bar F traveling on the rollers His readily taken up, so that the relative positions of the several partsand their operation are not-disturbed. In, the top of the steam-chest Bare arranged oil-cups Q,

located in such a manner as to lubricate the bearings and rollers I-I.

Having thus fully described my invention, I claim asnew and desire tosecure by Letters Patent 1. The combination,with the valve D, havingvertical sides D, the upper edges of which are beveled downward andinward, as at D and the inverted-boX-like yoke'E, mounted within thesides D, of the wedge-shaped packing J, filling the space between thebeveled edge D and the outer sides of the yoke E, and

means for adjusting the packing, substantially as set forth.

2. The combination, with the valve D,having vertical sides D, beveledinward and downward around its upper edge, bolts L, projecting upwardfrom said beveled edge D and the inverted-boX-like yoke E, inounted- Iwithin the sides D, of the wedge-shaped packing J, having slots throughwhich the bolts pass, and nuts .on the bolts pressing the packing intothe space between the beveled edge D and the outer sides of theyoke,'substantially as set forth.

3. The combination, with the valve-chest v and the valve-seatandlongitudinally-aligned rollers H, journaled in front and rear of thevalve-seat, of the valve D, sliding on said seat and having verticalsides, an inverted-boxlike yoke E within the sides, an interposedpacking, and alongitudinally-extending bar F, resting at its ends on therollers and connected between its ends to the yoke to support the same,substantially as set forth.

at. The combination of the rollers in front and rear of the valve-seatand the invertedbox-like yoke having a longitudinally-extendingsupporting-bar F, provided with grooves F F, receiving the upper partsof the rollers, with the slide-valve D, having vertical sides inclosingthe side walls of the box-like yoke and beveled inward and downward attheir uppenedges, wedge-shaped packing in the space thus formed,andbolts and nuts for adj usting the packing, substantially as setforth.

5. The combinatiomwiththe slide-valveand its side walls D beveled inwardand downward at their upper edges, of the box-like yoke fitting withinthe said side walls and having a supporting-bar mounted on rollers, thewedge-- shaped packing in the space formed by said bevel, and verticalset-screws O on the outer sides of the said yoke,wit-h their lower endsprojecting near to the upper edge of said packing or wall D, but out ofcontact therewith, snbstantially as set forth.

6. The combination, with the slide-valve having the vertical bolts L onits inward beveled upper edge D the wedge-shaped packing J and J, havingmortise-and-tenon connections J 2 J 3 and provided with verticalboltslots, through which said bolts pass, and the nuts holding thepacking down, of the inverted-boX-like yoke E, mounted within the sidesD and said packing and provided with ROLAND E. VANDEVENTER.

\Vitnesses WV. M. REID, A. HOFFMANN.

